You’re talking as if the Bible is one book. It isn’t. It’s 66 books. The intention of the likes of 1 Corinthians or Romans as a literal writing and instruction to the Church is different from Genesis which is written legend, or Isaiah which is prophecy. Or Judges which is a record of how badly everyone behaved. It’s like saying that you don’t need to treat the details in a Wikipedia article about Donald Trump as fact because they also have an article on the Mad Hatter from Alice’s Adventures in Wonderland which is fiction. “You’re picking and choosing what parts of Wikipedia to believe”